Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-04-2011, 11:36 AM
Registered User
 
Join Date: Apr 2011
Location: Toronto, Canada
Posts: 276
W115 1976 240D chugging for gas after purge.

I've done many diesel purges before, I'm not sure why its chugging and stalling for gas.

I've bleed it as required in the mercedes manual... I'm not sure what to do. Could I of possibly blown the injector pump? I doubt that but who knows. I wonder if there is possibly still air in the system?

Please help!!

Heres a videw of how it runs, the sound is messed up so turn your speakers a bit louder. YouTube - VID 20110503 00017

Reply With Quote
  #2  
Old 05-04-2011, 03:15 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 35,074
Air Leak?

This is where it would be nice if there was a Fuel Supply Pressure Gauge on these vehicles. It could be an issue with the Pressure Relief/Overflow Valve on the Rear of the IP or maybe something is holding one of the Fuel Supply/Lift Pump valves open.

You might try pumping on the Hand Primer while the Engine is running and see if while you are pumping things improve. If things improve you have some sort of Fuel Supply issue.

If the Purge is done by recirculating the Purge Fluid. Maybe the Secondary Spin-on Filter is plugged by the stuff that was purged out of the IP housing?

If you do the Injector Cut Out Test and see if it is a specific Cylinder having the issue.
Then swap the Injector from the bad Cylinder with one of the ones from a good Cylinder and see if the problem follows the Injector from the suspect Cylinder.
If it follows the Injector it may be something had gotten inside of the Injector.
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #3  
Old 05-04-2011, 03:52 PM
katja's Avatar
High Maintenance
 
Join Date: Jul 2005
Posts: 307
Did you get all the fittings tight when you put the lines back on? I would guess an air leak or newly-formed crack at the prefilter since you disconnect there to do the purge.
I once had a fuel leak there near the clamp and didn't notice any fuel leaking there, but it sure let air in, stopping the engine. Or as Diesel911 said, the main filter is clogged. You could let some fuel out at the nut near the bottom of the filter can to check what comes out (see if it's watery or dirty).

Couldn't hear much on the video except what sounds like a very bad exhaust leak (or do you even have the entire exhaust system on?)
__________________
1976 240D "Katja"
Reply With Quote
  #4  
Old 05-04-2011, 04:10 PM
Registered User
 
Join Date: Nov 2007
Location: Palm Bay Fl
Posts: 426
If you have been pumping the hell out of the hand primer pump it may have an air leak.
all my cars i have the newer style primer pump. This may not be your problem i thought i would say something because i had a similer problem.

it defentley sems like you are only runing on a couple cilenders.

crack each injector line if the idel changes move on intill nothing changed there you should start looking for the issue.
__________________
1976 240D
1976 240D parts car
1970 220D daily driver
Reply With Quote
  #5  
Old 05-04-2011, 10:12 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 35,074
Quote:
Originally Posted by katja View Post
Did you get all the fittings tight when you put the lines back on? I would guess an air leak or newly-formed crack at the prefilter since you disconnect there to do the purge.
I once had a fuel leak there near the clamp and didn't notice any fuel leaking there, but it sure let air in, stopping the engine. Or as Diesel911 said, the main filter is clogged. You could let some fuel out at the nut near the bottom of the filter can to check what comes out (see if it's watery or dirty).

Couldn't hear much on the video except what sounds like a very bad exhaust leak (or do you even have the entire exhaust system on?)
I did not notice his Year. If he has the Cartridge type Fuel Filter he could pull the Cartridge out and take a look at it. But, still better to change it to be sure that at least that part of the system is OK.
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #6  
Old 05-04-2011, 10:28 PM
79Mercy's Avatar
Registered User
 
Join Date: Mar 2008
Location: Florida
Posts: 4,131
I don't think it would make a difference but i think you have the clear filter installed backwards. How did it run before you did the purge?
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
Reply With Quote
  #7  
Old 05-05-2011, 09:08 AM
Registered User
 
Join Date: Apr 2011
Location: Toronto, Canada
Posts: 276
Ok I got her fixed. These are the steps I followed:

1) I filled in the main fuel canaster with diesel to the top
2) I syphoned the fuel line going to this canaster
3) I retightened this canster and then focused on the small clear filter
4) I syphoned the fuel line going to the small clear filter and attached it very tightly
5) I quickly manual primed the Injector Pump until I saw fuel coming into the clear filter
6) I untightened the injector pump bleed screw and primed until I saw fuel and tigtened it back up
7) I started the car and it ran like crap, while it was running I hand primed the injector pump a few more times and it ran like NEW.

I think these steps to insure that there is NO air stuck in the IP or the fuel system. Since I've done this I've had NO issues...

I also just found a AC system in my 76.. I'm not even gonna try messing with that LOL
Reply With Quote
  #8  
Old 05-05-2011, 01:08 PM
Registered User
 
Join Date: Nov 2007
Location: Palm Bay Fl
Posts: 426
good job

__________________
1976 240D
1976 240D parts car
1970 220D daily driver
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 12:23 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page